Yes, if you write the decrypted file to disk, it could be recovered. Deleting files only removes the file system entries - it does not wipe the content.
Use a local password manager. KeePass (use the KeePassXC variant on Linux) is the most popular choice. If you prefer a command line tool, pass (passwordstore.org) is an option.
I think they covered it with black foam, because they do not want to reveal what camera they use.